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        <h1 class="title">03_创建动画过程</h1>
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            <span>四月 06, 2022</span>
            
  <ul class="post-tags-list" itemprop="keywords"><li class="post-tags-list-item"><a class="post-tags-list-link" href="/tags/MATLAB%E5%AD%A6%E4%B9%A0/" rel="tag">MATLAB学习</a></li></ul>


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            <h1 id="三、创建动画过程"><a href="#三、创建动画过程" class="headerlink" title="三、创建动画过程"></a>三、创建动画过程</h1><h2 id="1、三维图形不同姿态"><a href="#1、三维图形不同姿态" class="headerlink" title="1、三维图形不同姿态"></a>1、三维图形不同姿态</h2><p><strong>从不同角度观察物体所看到的物体形状是不一样的，同样从不同视点绘制的三维图形其形状也是不一样的。视点位置可由方位角和仰角表示，Matlab提供了设置视点的函数。</strong></p>
<ul>
<li><p>语法格式：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">view(az,el)  </span><br></pre></td></tr></table></figure>

<blockquote>
<ul>
<li>az 为方位角，el 为仰角，它们均以度为单位</li>
<li>系统默认的视点定义为：<ul>
<li>方位角 -37.5度，</li>
<li>仰角  30度</li>
</ul>
</li>
</ul>
</blockquote>
</li>
<li><p>例：从不同试点绘制多封函数曲面</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">subplot(<span class="number">2</span>,<span class="number">2</span>,<span class="number">1</span>);mesh(peaks);     <span class="comment">% subplot：在各个分块位置创建坐标区  mesh：网格曲面图 peaks：峰值函数</span></span><br><span class="line">view(<span class="number">-37.2</span>,<span class="number">30</span>);title(<span class="string">&#x27;方位角 = 37.5度 ，仰角 = 30度&#x27;</span>);<span class="comment">% view 相机曲线</span></span><br><span class="line">subplot(<span class="number">2</span>,<span class="number">2</span>,<span class="number">2</span>);mesh(peaks);</span><br><span class="line">view(<span class="number">0</span>,<span class="number">90</span>);title(<span class="string">&#x27;方位角 = 0度 ， 仰角 = 90度&#x27;</span>);</span><br><span class="line">subplot(<span class="number">2</span>,<span class="number">2</span>,<span class="number">3</span>);mesh(peaks);</span><br><span class="line">view(<span class="number">90</span>,<span class="number">0</span>);title(<span class="string">&#x27;方位角 = 90度 ， 仰角 = 0度&#x27;</span>);</span><br><span class="line">subplot(<span class="number">2</span>,<span class="number">2</span>,<span class="number">4</span>);mesh(peaks);</span><br><span class="line">view(<span class="number">-7</span>,<span class="number">-10</span>);title(<span class="string">&#x27;方位角 = -7度 ， 仰角 = -10度&#x27;</span>)</span><br></pre></td></tr></table></figure>

<p><img src="https://s2.loli.net/2022/04/07/JPaZczdUChfTnIB.png" alt="image-20220407134447263"></p>
<blockquote>
<p><strong>peaks</strong>（峰值函数）是<strong>MATLAB</strong>自带的函数，<strong>peaks</strong> 函数是</p>
<p>典型的多元函数，其本质是二元高斯分布的概率密度函数。</p>
</blockquote>
</li>
</ul>
<h2 id="2、动画函数"><a href="#2、动画函数" class="headerlink" title="2、动画函数"></a>2、动画函数</h2><h4 id="（1）-getframe函数"><a href="#（1）-getframe函数" class="headerlink" title="（1） getframe函数"></a>（1） <code>getframe</code>函数</h4><ul>
<li><p>语法格式：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">getframe(n)  </span><br><span class="line"><span class="comment">% 生成动画的数据矩阵，它截取每幅画面信息（动画中的一帧）并保存为一个n幅画面的列向量</span></span><br></pre></td></tr></table></figure></li>
</ul>
<h4 id="（2）moviein函数"><a href="#（2）moviein函数" class="headerlink" title="（2）moviein函数"></a>（2）<code>moviein</code>函数</h4><ul>
<li><p>语法格式：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">moviein(n)</span><br><span class="line"><span class="comment">% 用来建立一个足够大的n列矩阵。为保存n幅画面的数据创建一个空间，以备快速播放</span></span><br></pre></td></tr></table></figure></li>
</ul>
<h4 id="（3）movie函数"><a href="#（3）movie函数" class="headerlink" title="（3）movie函数"></a>（3）<code>movie</code>函数</h4><ul>
<li><p>语法格式：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">movie(m,n)</span><br><span class="line"><span class="comment">% 播放由矩阵m所定义的画面n次，默认是播放一次</span></span><br></pre></td></tr></table></figure></li>
</ul>
<h4 id="（4）drawnow函数"><a href="#（4）drawnow函数" class="headerlink" title="（4）drawnow函数"></a>（4）<code>drawnow</code>函数</h4><ul>
<li><p>语法格式：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">drawnow</span><br><span class="line"><span class="comment">% 刷新屏幕。当代码执行时间长，需要反复执行绘图，该函数可实现看到图像每一步的变化情况</span></span><br></pre></td></tr></table></figure></li>
</ul>
<h2 id="3、创建动画步骤"><a href="#3、创建动画步骤" class="headerlink" title="3、创建动画步骤"></a>3、创建动画步骤</h2><p>（1）调用 <code>moviein</code> 函数对内存进行初始化，创建一个足够大的矩阵，使之能容纳基于当前坐标轴大小的一系列指定图形</p>
<p>（2）调用 <code>getframe</code> 函数把捕捉的动画逐一生成帧。该函数返回一个列矢量，利用这个矢量创建一个电影动画矩阵。一般将该函数放到 <code>for循环</code> 中可得到一系类的动画帧</p>
<ul>
<li><p>语法格式：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">F = geffame    		<span class="comment">% 从当前图形框中得到动画帧</span></span><br><span class="line">F = geffame(f) 		<span class="comment">% 从图形句柄h中得到动画帧</span></span><br><span class="line">F = geffame(h,rect) <span class="comment">% 从图形句柄h中得指定区域 rect中得到动画帧</span></span><br></pre></td></tr></table></figure></li>
</ul>
<p>（3）调用 <code>movie</code>函数按照指定的速度和次数运行该动画。当创建了一系列的动画帧后，可以利用<code>movie 函数</code>播放这些动画帧</p>
<ul>
<li><p>语法格式：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">movie(M) 			<span class="comment">% 将矩阵M中的动画帧播放一次     movie 播放录制的影片帧</span></span><br><span class="line">movie(M,n)			<span class="comment">% 将矩阵M中的动画帧播放n次</span></span><br><span class="line">movie(M,n,fps)		<span class="comment">% 将矩阵M中的动画帧以每秒 fps 帧的速度播放n次</span></span><br></pre></td></tr></table></figure>
</li>
<li><p>例：绘制peaks 函数曲面并且播放它绕z轴旋转的动画</p>
<p>程序命令：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">clear;</span><br><span class="line">peaks(<span class="number">30</span>);axis off;              <span class="comment">% axis设置坐标轴范围和横纵比  axis visbility 坐标曲线条和背景的可见性</span></span><br><span class="line">shading interp;colormap(hot);    <span class="comment">% shading 设置颜色着色属性  colormap 查看并设置当前颜色图</span></span><br><span class="line">m = moviein(<span class="number">20</span>);                 <span class="comment">% 建立20列矩阵</span></span><br><span class="line"><span class="keyword">for</span> <span class="built_in">i</span>=<span class="number">1</span>:<span class="number">20</span> </span><br><span class="line">    view(<span class="number">-27.5</span>+<span class="number">24</span>*(<span class="built_in">i</span> <span class="number">-1</span>),<span class="number">30</span>)</span><br><span class="line">    m(:,<span class="built_in">i</span>)=getframe;             <span class="comment">% 捕获坐标曲或图窗作为影片区</span></span><br><span class="line"><span class="keyword">end</span></span><br><span class="line">movie(m,<span class="number">2</span>)                       <span class="comment">% 播放画面两次</span></span><br></pre></td></tr></table></figure>

<p><img src="https://s2.loli.net/2022/04/07/94otDUIvjuZYQp8.png" alt="image-20220407152133092"></p>
</li>
<li><p>例：播放一个直径不断变化的球体动画</p>
<p>程序命令：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">n = <span class="number">30</span>;</span><br><span class="line">[x,y,z]=sphere;                  <span class="comment">% sphere创建球面</span></span><br><span class="line">m=moviein(n);</span><br><span class="line"><span class="keyword">for</span> <span class="built_in">i</span> = <span class="number">1</span>:n</span><br><span class="line">    surf(<span class="built_in">i</span>*x,<span class="built_in">i</span>*y,<span class="built_in">i</span>*z)            <span class="comment">% surf 曲面图</span></span><br><span class="line">    m(:,<span class="number">1</span>)=getframe;</span><br><span class="line"><span class="keyword">end</span></span><br><span class="line">movie(m,<span class="number">2</span>);</span><br></pre></td></tr></table></figure>

<blockquote>
<p><a target="_blank" rel="noopener" href="https://ww2.mathworks.cn/help/matlab/ref/surf.html">surf</a></p>
</blockquote>
<p><img src="https://s2.loli.net/2022/04/08/Oq4gRvZD23Y5eWQ.png" alt="image-20220408091058462"></p>
</li>
<li><p>例播放袁皇上的画圆动画</p>
<p>程序命令：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">x=<span class="number">0</span>:<span class="number">0.01</span>:<span class="number">2</span>*<span class="built_in">pi</span>;</span><br><span class="line">y=<span class="built_in">sin</span>(x);z=<span class="built_in">cos</span>(x);</span><br><span class="line">h=<span class="built_in">plot</span>(y,z,<span class="string">&#x27;b-&#x27;</span>);</span><br><span class="line">axis([<span class="number">-2</span> <span class="number">2</span> <span class="number">-2</span> <span class="number">2</span>]);</span><br><span class="line"><span class="built_in">hold</span> on;</span><br><span class="line">axis square;</span><br><span class="line"><span class="keyword">for</span> k=<span class="number">0</span>:<span class="number">0.01</span>:<span class="number">2</span>*<span class="built_in">pi</span></span><br><span class="line">    x=<span class="built_in">sin</span>(k);</span><br><span class="line">    y=<span class="built_in">cos</span>(k);</span><br><span class="line">    <span class="built_in">plot</span>(x,y,<span class="string">&#x27;r*&#x27;</span>);title(<span class="string">&#x27;播放在圆环上画圆的动画&#x27;</span>)</span><br><span class="line">    drawnow;  <span class="comment">% 更新图窗并处理回调</span></span><br><span class="line"><span class="keyword">end</span></span><br></pre></td></tr></table></figure>

<p><img src="https://s2.loli.net/2022/04/09/hPnpjE6XoM1BKrU.png" alt="image-20220409110857160.png"></p>
</li>
<li><p>例：播放绘制衰减曲线 <img src="https://s2.loli.net/2022/04/09/NurGwBAsTMFLa7I.jpg" alt="6d3ec6190c380fe23b34ee83792fb31.jpg" style="zoom: 25%;" />的动图</p>
<p>程序命令：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">x=<span class="number">0</span>:<span class="number">0.1</span>:<span class="number">8</span>*<span class="built_in">pi</span>;</span><br><span class="line">h=<span class="built_in">plot</span>(x,<span class="built_in">sin</span>(x).*<span class="built_in">exp</span>(-x/<span class="number">5</span>));title(<span class="string">&#x27;播放绘制衰减曲线的动画&#x27;</span>)   <span class="comment">% &quot;EraseMode\属性可以实现显示新对象，擦除旧对象，而又不破坏背景图案。</span></span><br><span class="line">axis([-<span class="built_in">inf</span> <span class="built_in">inf</span> <span class="number">-1</span> <span class="number">1</span>]);grid on</span><br><span class="line"><span class="keyword">for</span> <span class="built_in">i</span>=<span class="number">1</span>:<span class="number">5000</span></span><br><span class="line">    y=<span class="built_in">sin</span>(x+<span class="built_in">i</span>/<span class="number">50</span>).*<span class="built_in">exp</span>(-x/<span class="number">5</span>);</span><br><span class="line">    set(h,<span class="string">&#x27;ydata&#x27;</span>,y);               <span class="comment">% 设置新坐标</span></span><br><span class="line">    drawnow                         <span class="comment">% 刷新</span></span><br><span class="line"><span class="keyword">end</span></span><br></pre></td></tr></table></figure>

<p><a href="https://fubaisen.github.io/2022/03/31/MATLAB%E5%AD%A6%E4%B9%A0/%E8%A1%A5%E5%85%85%E6%96%87%E4%BB%B6/16_EraseMode%E4%BB%A3%E6%9B%BF%E6%96%B9%E6%B3%95">EraseMode代替方法</a></p>
</li>
<li><p>例：绘制带圆盘的峰值动图效果图</p>
<p>程序命令：</p>
<figure class="highlight matlab"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">clear;</span><br><span class="line">r=<span class="built_in">linspace</span>(<span class="number">0</span>,<span class="number">4</span>,<span class="number">30</span>);</span><br><span class="line">t=<span class="built_in">linspace</span>(<span class="number">0</span>,<span class="number">2</span>*<span class="built_in">pi</span>,<span class="number">50</span>);</span><br><span class="line">[rr,tt]=<span class="built_in">meshgrid</span>(r,t);</span><br><span class="line">xx=rr.*<span class="built_in">cos</span>(tt);</span><br><span class="line">yy=rr.*<span class="built_in">sin</span>(tt);</span><br><span class="line">zz=peaks(xx,yy);</span><br><span class="line">n=<span class="number">30</span>;</span><br><span class="line">scale=<span class="built_in">cos</span>(<span class="built_in">linspace</span>(<span class="number">0</span>,<span class="number">2</span>*<span class="built_in">pi</span>,n));</span><br><span class="line"><span class="keyword">for</span> <span class="built_in">i</span>=<span class="number">1</span>:n</span><br><span class="line">    surf(xx,yy,zz*scale(<span class="built_in">i</span>));</span><br><span class="line">    axis([-<span class="built_in">inf</span> <span class="built_in">inf</span> -<span class="built_in">inf</span> <span class="built_in">inf</span> <span class="number">-8.5</span> <span class="number">8.5</span>]);</span><br><span class="line">    box on     </span><br><span class="line">    M(<span class="built_in">i</span>)=getframe;</span><br><span class="line"><span class="keyword">end</span></span><br><span class="line">movie(M,<span class="number">5</span>)</span><br></pre></td></tr></table></figure>

<p><img src="https://s2.loli.net/2022/04/09/dM8clfGHPryWB4e.png" alt="image-20220409163128117.png"></p>
</li>
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